Finance Receivables - Changes In The Allowance For Finance Credit Losses On Finance Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 189,885	$ 192,471	$ 173,343
Provision for credit losses	134,536	106,870	132,444
Charge-offs	(173,358)	(154,441)	(160,972)
Recoveries	47,518	44,985	47,656
Balance, end of period	198,581	189,885	192,471
Retail
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	182,098	186,254	166,810
Provision for credit losses	132,243	105,292	132,760
Charge-offs	(173,358)	(154,433)	(160,972)
Recoveries	47,518	44,985	47,656
Balance, end of period	188,501	182,098	186,254
Wholesale
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	7,787	6,217	6,533
Provision for credit losses	2,293	1,578	(316)
Charge-offs	0	(8)	0
Recoveries	0	0	0
Balance, end of period	$ 10,080	$ 7,787	$ 6,217